package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }
    @Override
    public void add(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmeal.setCreateTime(LocalDateTime.now());
        setmeal.setUpdateTime(LocalDateTime.now());
        //向套餐表插入数据
        setmealMapper.add(setmeal);
        //获取生成的套餐id
        Long id = setmeal.getId();
        List<SetmealDish> setmeales = setmealDTO.getSetmealDishes();
        setmeales.forEach(setmealDish -> {
            setmealDish.setSetmealId(id);
        });
        //保存套餐和菜品的关联关系
        setmealDishMapper.insertBatch(setmeales);
    }
    @Override
    public void delete(List<Long> ids) {
        ids.forEach(id -> {     //遍历id集合
            //根据id查询套餐信息
            Setmeal setmeal = setmealMapper.getById(id);
            //判断套餐是否在售
            if(StatusConstant.ENABLE == setmeal.getStatus()){
                //在售的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        ids.forEach(setmealId -> {   //遍历id集合
            //删除套餐表中的数据
            setmealMapper.deleteById(setmealId);
            //删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });
    }
    @Override
    public SetmealVO getById(Long id) {
        SetmealVO setmeal = setmealMapper.getId(id);
        return  setmeal;
    }
    @Override
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmeal.setUpdateTime(LocalDateTime.now());
        setmealMapper.update(setmeal);   //1、修改套餐表，执行update
        Long id = setmeal.getId();    //获取套餐id
        //删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
        setmealDishMapper.deleteBySetmealId(id);
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes(); //获取套餐和菜品
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(id);
        });
        //保存套餐和菜品的关联关系，操作setmeal_dish表，执行insertBatch
        setmealDishMapper.insertBatch(setmealDishes);
    }

    public void updateStatus(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status == StatusConstant.ENABLE) {
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if (dishList != null && dishList.size() > 0) {
                dishList.forEach(dish -> {
                    if (StatusConstant.DISABLE == dish.getStatus()) {
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .updateTime(LocalDateTime.now())
                .build();
        setmealMapper.update(setmeal);
    }
    /*             __________________________User______________________________*/
    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
